code: def test_reverse_ucurve():
      ab = []
      a = [1, 2, 3, 4, 5, 6, 7, 8]
      b = [2, 4, 6, 8, 7, 5, 3, 1]
      ab.append([a, b])
      a = [1]
      b = [1]
      ab.append([a, b])
      a = [1, 2]
      b = [2, 1]
      ab.append([a, b])
      a = [1, 2, 3]
      b = [2, 3, 1]
      ab.append([a, b])
      a = [1, 2, 3, 4]
      b = [2, 4, 3, 1]
      ab.append([a, b])
  
      for a, b in ab:
          assert reverse_ucurve_list(a) == b
          assert undo_reverse_ucurve_list(b) == a
  
file_path: h2ogpt/tests/test_utils.py
imports: import sys
  import pytest
  from src.utils import get_list_or_str, read_popen_pipes, get_token_count, reverse_ucurve_list, undo_reverse_ucurve_list
  from tests.utils import wrap_test_forked
  import subprocess
label_desc: Use image node_id 5 for calling a global function with example usage: test_reverse_ucurve() without return types